I installed an AFPR a while back. I had 39psi with igntion ON, engine OFF, with vacuum line connected. 30psi w/engine ON at idle. This is stock.
I upped the pressure to 46psi with the above mentioned conditions. I did notice a SOTP increase but I also had headers and MSD6AL installed at the same time.
After re-reading the tech section, I'm a little confused.
Can someone please tell me how to properly set it.
1. Should I test it at idle or just with the ignition ON?
2. Should I do it with the vacuum line ON or OFF?
3. What is the best aproximate PSI setting for a TPI305 wth my current mods(below)
I thank all who respond, in advance.


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1990 Formula
Factory:TPI-305/Dual Cat(230hp),5 Speed,3.42 rear.
Dealer instaled:Aluminum Drive Shaft
Mods:SLP air foil,K&N Filter, Accel:wires,coil cap,rotor.Hypertech Thermomaster chip,Stat,Fan switch,TES headers,MSD6AL,AFPR(46), Harwood fiberglass hood,Original GM "Notchback GTA" hatch.
Flowmaster 3" Cat-back exhaust,TB coolant bypass, Centerforce dual friction clutch, Ported Plenum (???HP)
DIRECT LINK TO PICS OF MY CAR. NO WEB-PAGE. http://community-2.webtv.net/MZavraz...A90/page9.html

 

Take the vaccum line off and just turn the key to the on position. That is how I did mine. I have mine set at 36 or so PSI that way and my car runs the best at that. But that is pretty much the stock setting. I have Catco Cat to mandrel bent exhaust 5 speed super coil bla bla bla and I love how my car runs. I would say try 40 or so psi and see how that works. But you will also have to take the car out and run at WOT to see if the psi stays the same.